Mold for forming parts of complex shape of injectable or thermosetting plastic material

ABSTRACT

In a mold for casting parts of complex shape having a central core and multiple flat elements parallel to each other and in spaced relation of the same type as cam units of injectable or thermosetting plastic material and for the automatic ejection of said parts during opening of the mold which can be employed in an automatic press and comprising a stationary portion, a first group of slides which are mounted on two slide-blocks displaceable within said stationary portion in opposite directions at right angles to the movement of opening of the mold and which serve to define the interval between the elements of the molded part and a second group of slides which are mounted on two further slide-blocks displaceable in opposite directions at right angles to the first and which serve to define the profiles of said part elements, said four slide-blocks being closed in the centripetal direction in the position of closure of the mold and maintained towards the center of said mold by the conical wall of a movable cap of the mold and separated at the time of opening of the mold by inclined columns rigidly fixed to said movable cap and adapted to form ramps which are intended to cooperate with inclined bores formed in said slide-blocks, the essential property which lies in the fact that the inclined bores are of greater diameter than the columns in order to provide said columns with play which can be taken up at the beginning of the opening travel of the mold so that the opening of said mold can be initiated prior to commencement of lateral displacement of the slide-blocks in the centrifugal direction.

United States Patent 1191 J ullien-Davin Dec. 18, 1973 [54] MOLD FORFORMING PARTS OF 1,456,836 9/1966 France 425/D1G. 5 COMPLEX SHAPE OFINJECTABLE 0 399,723 3/1966 Switzerland 425/D1G. 5

[30] Foreign Application Priority Data May 29, 1969 France 6917968 [52]US. Cl. 425/441, 425/D1G. 5, 249/66, 425/242, 425/438, 425/450 C,425/DIG. 58, 249/184, 249/142 [51] Int. Cl. B291: 7/00 [58] Field ofSearch 425/242, 247, 249, 425/436, 438, 441, 444, 450, 450 C, 468, DIG.5, DIG. 58; 249/56, 57, 58, 59, 63, 66, 67, 68, 175, 184, 180, 186

[56] References Cited UNITED STATES PATENTS 3,289,252 12/1966 Bromley425/DIG. 5 3,473,197 10/1969 Wilds et al.. 425/DIG. 5 3,564,660 2/1971Darnell 425/D1G. 5 3,049,759 8/1962 Eberhardt.... 425/DlG. 5 3,373,4603/1968 Lodney 425/DIG. 5 1,475,032 11/1923 Shrum et a1. 425/DIG. 53,387,323 6/1968 Wyllie et a1 249/59 X 3,226,771 l/l966 Szugda 1.425/D1G. 5 2,982,997 5/1961 Peickii et a1. 425/DIG. 47

3,154,978 11/1964 Baker 425/DIG. 5 3,193,884 7/1965 Haynie et a1425/DIG. 47 FOREIGN PATENTS OR APPLICATIONS 747,330 4/1956 Great Britain425/DIG. 5

THERM OSETTING PLASTIC MATERIAL Inventor: Jean Jullien-Davin, Valence,France Assignee: Crouzet, Paris, France Filed: May 9, 1972 Appl. No.:251,783

Related US. Application Data Continuation of Ser. No. 40,573, May 26,1970, abandoned.

Primary Examiner.l. Howard Flint, Jr. Attorney-John C. Holman et a1.

[57] ABSTRACT In a mold for casting parts of complex shape having acentral core and multiple flat elements parallel to each other and inspaced relation of the same type as cam units of injectable orthermosetting plastic material and for the automatic ejection of saidparts during opening of the mold which can be employed in an automaticpress and comprising a stationary portion, a first group of slides whichare mounted on two slideblocks displaceable within said stationaryportion in opposite directions at right angles to the movement ofopening of the mold and which serve to define the interval between theelements of the molded part and a second group of slides which aremounted on two further slide-blocks displaceable in opposite directionsat right angles to the first and which serve to define the profiles ofsaid part elements, said four slide-blocks being closed in thecentripetal direction in the position of closure of the mold andmaintained towards the center of said mold by the conical wall of amovable cap of the mold and separated at the time of opening of the moldby inclined columns rigidly fixed to said movable cap and adapted toform ramps which are intended to cooperate with inclined bores formed insaid slide-blocks, the essential property which lies in the fact thatthe inclined bores are of greater diameter than the columns in order toprovide said oolumns with play which can be taken up at the beginning ofthe opening travel of the mold so that the opening of said mold can beinitiated prior to commencement of lateral displacement of theslide-blocks in the centrifugal direction.

7 Claims, 4 Drawing Figures PATENIEDBEMBIQH- 3.779 688 SHEET 2 BF 3 A"cu/Eve MOLD FOR FORMING PARTS OF COMPLEX SHAPE OF INJECTABLE ORTHERMOSETTING PLASTIC MATERIAL The present application is a Continuationapplication of Ser. No. 40573 filed May 26, 1970, now abandoned.

BACKGROUND OF THE INVENTION The present invention is concerned with animproved mold for forming parts of complex shape of injectable orthermosetting plastic material such as sets of cams of unit constructionfor washing machine programmers which call for adjustable angularsettings and expedients for demolding.

It is known that provision is made in washing machine programmers for aplurality of contacts controlled by means of cams which are assembled soas to form a drum and that, in order to solve problems of low capitaloutlay and of accuracy of the relative angular setting of cams,consideration has been given to the construction of all the cams in asingle unit.

PRIOR ART French Pat. No. 1,399,172 with Italian priority of Oct. 7,1963 described means for constructing said cam units in one piece byinjection into a suitable mold which is provided with a series of slidesin order to permit demolding of the spaces located between the differentcams by means of a suitable device, the assembly which is thus formedcan then be displaced axially by one step so as to permit opening of aseries of slides for defining the cam profiles.

The means just mentioned which were employed in the prior art and whichhad hitherto constituted a technological improvement are no longersufficient to meet the requirements of low cost and high productionrates in fact, the manufacture of said means entails the presence of anoperator for the purpose of removing the part from the mold afteropening of this latter and provision was made for a central pin orhollow metallic sleeve on which the part was overmolded. Although thisarrangement has an advantage in that it avoids the problem of extractionof the central core from a relatively delicate part, there isnevertheless a disadvantage in that is is necessary in the case of eachpart not only to supply said pin or sleeve but also to place said partinside the mold.

Programming of the successive demolding stages makes it necessary tomake allowance for safety periods which do not permit complete openingas a result of continuous motion of the press on which the mold ismounted.

OBJECTS AND SUMMARY OF THE INVENTION A first object of the invention isto form a mold which obviates the need for a part such as a pin orhollow sleeve and which can be employed in an automatic machine withoutrequiring the presence of an operator, the different stages of thedemolding operation including complete ejection of the part from themold being carried out by virtye of integrated moving elements which arepositively driven solely as a result of the continuous opening motion ofthe press.

A second object of the invention is to provide means which permit thepossibility of adjustment of angular setting of predetermined elementsof the cam unit. In fact, although a fixed angular setting of the camsin realtion to each other is desirable when said cams are intended tocontrol components of a similar type such as, for example, metallicstrips which are inserted in a common support, it has already beenapparent for a long time that considerable difficulty is involved inproviding for a fixed angular setting of optimum value between thedifferent elements of the cam unit when the components which cooperatewith said elements are of different types. For example, one of the camsmay thus have to control a level of plastic material which exhibitseither shrinkage or deformation after molding (not readily predictablewith any degree of accuracy) and which is pivotally mounted with play ona pin fixed at a point other than the point of insertion of the metallicstrips. Alternatively, the cam unit and with a set of teeth so as to bedriven in step-by-step motion by means of a pawl, is provided withanother set of teeth for the purpose of cooperating with a positioningmember (such as an elastic pawl, for example) and has means for angularpositioning of a second set of cams which are intended to undergo anaxial displacement with respect to the first set.

It is understood that, if the angular settings are fixed, it willaccordingly be necessary to provide very close tolerances in the case ofeach component including the frame and this always entails a highcapital cost. If a defeet is found at the time of assembly, it will alsobe necessary ro re-make or modify either a tool or a mold and these arehighly time-consuming and expensive operations.

However, taking into account the fact that parts which are molded orcut-out in large scale production are always similar to each other evenif they do not always closely conform to specifications, finaladjustment will clearly take less time and provide easier if the angularsetting can be carried out on the molding tool at the beginning of aproduction run without entailing the need to demount the tool. Forexample, if there is every evidence at the time of assembly that thestep-bystep driving pawl is slightly too short, it will only benecessary to set the driving teeth with a slight time-lag with respectto the cams whereas on the contrary, if the positioning pawl is found tobe too long, it will in that case only be necessary to set thecorresponding teeth with a slight lead.

Each time the need arises in a programmer of known type to contemplatelarge-scale manufacture with a new set of cams (for a new customer), itwill be necessary when making use of the means according to theinvention to ensure that the first cam unit is correctly mounted andthat the angular settings are accurate, which is only a matter of a fewminutes the angular settings are adjusted if necessary and a test isagain carried out. Final adjustment is thus completed and has notentailed any disassembly of the mold which has remained on the press andhas not even required cooling. It then only remains to start theproduction run.

The means employed for the achievement of these two objects of theinvention will now be described with reference to the accompanyingdrawings, in which BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 showsdiagrammatically a mold in accordance with the invention, the movableportion of which has been removed FIG. 2 is a sectional view which istaken along line II-II of FIG. 1 and serves to provide a clearunderstanding of the operation FIG. 3 is a part-sectional view which istaken along one of the lines III-Ill of FIG. 2 and shows the means foradjusting the angular settings of the mold elements which define the endportions of the part and FIG. 4 is a plan view showing a slide-block inwhich a slide for defining the cam profile is provided with means foradjusting the angular setting of the cam.

DETAILED DESCRIPTION OF THE INVENTION In order to achieve the firstobject of the invention, the mold which comprises in known manner afirst series of slides 1 mounted on two slide-blocks 2 which are adaptedto move in two opposite radial guides so as to define the intervalbetween the cams 3a and a second series of slides 4 mounted on twofurther slide-blocks 5 which are also adapted to move in two oppositeradial guides so as to define the profiles of the different cams 3awith, said four slide-blocks being each provided on the one hand, on theside located externally of the mold, with a conical portion of surface2a and 5a in coincident relation in the position of closure of the moldwith the internal conical surface 6a of a bell-head or conical cap 6which is rigidly fixed to one of the movable portions of the mold andmaintains said slideblocks applied against each other in pairs and, onthe other hand, with means known per se for displacing said slide-blocksradially at the time of opening of the mold, with said means essentiallyconsisting of inclined bores 2b-5b adapted to cooperate with inclinedcolumns 7, 8 which are rigidly fixed to the same movable portion of themold, is characterized by a combination of means for carrying out thefollowing successive steps in one complete cycle a. During the veryfirst millimeters of the opening travel initial demolding (detachment)of the central core 9 and sprue 3b while the part 3 is still firmlymaintained (this operation calls for the application of a considerableeffort which is incompatible with the action of some ejectors ofconventional type, especially if the core is provided with ribs 9a).

b. End of extraction of the core (without effort) and simultaneousradial opening of the guide units of the slides 1 which define theintervals between the cams.

0. Displacement of the part 3 by one half-pitch so as to permitdemolding of cam profiles in the only possible direction (axialdirection).

d. Radial opening of the slide-blocks of the slides 4 which define theprofiles.

e. Longitudinal displacement of the molded part 3 in the direction ofdisplacement of the movable portion of the mold to an extent which issufficient to ensure that the part is completely outside the moldcavity.

f. Disengagement of the part 3 from the supporting mandrel 10 which hasbrought said part away from the mold.

g. Dropping of the part 3 (horizontal press) or ejection of the part andattached sprue by means ofa compressed air jet (vertical press).

h. Re-closure of the mold for a further injection (order of operationswhich is the reverse of the preceding).

i. Injection of another part.

The means employed for carrying out these functions are On the movableportion 6 of the mold, a conical cavity 60 for bringing the slide-blocks2, 5 back towards the center when the mold is closed, two inclinedcolumns 7 serving as ramps in order to move away from the center theslide-blocks 2 which carry the first groups of slides l for defining theintervals between the cams 3a, two special columns 8 essentiallycomprising a portion 8a which is parallel to the longitudinal axis ofthe mold and an inclined portion 8b which forms a ramp for displacingfrom the center and at the proper time the slide-blocks S which carrythe second series of slides for defining the cam profiles, a centralmember 11 comprising cylindrical portions 11a, 11b having differentdiameters and annular shoulders for centering and positioning saidmember in the axial direction within the movable portion 6 of the mold,a conical recess so as to receive (in known manner) the injection nozzleof the press, a cylindrical portion 11d provided with an axial injectionpassage lle on which is adjusted externally the core 9 for defining theinternal shape of the part to be molded with radial arms or ribs 9a andmold elements 12 for defining special details such as, for example, aninternal set of teeth or a set of teeth on the outer face of the part tobe molded, a backing-plate 13 for holding the central member in astationary position.

On the exterior of the movable portion of the mold, at least one lug 6bprovided with ramps for actuating in the course of its travel at leastone bell-crank lever 14 which is intended to control step (c).

On the stationary portion of the mold, a base 15 provided with radialguides for the slide-blocks 2 which support the first group of slides 1,the slide-blocks 2 which are characterized in that the oblique bores 2bwhich cooperate with the inclined columns 7 are ovalized so as toprovide play in the radial direction in order that the upper portion 6of the mold should have a short portion of travel during which theinclined columns 7 are intended to take up the said play beforebeginning to drive the slide-blocks 2 in the direction of opening andthus permitting the execution of step (a) radial guides for theslide-blocks 5 which support the second group of slides 4 for definingthe cam profiles 3a, the slide-blocks 5 being characterized in that theoblique openings 5b which cooperate with the special columns 8 are veryelongated in order to permit the passage of the portions 8a which areparallel to the axis of the mold and form part of said special columns 8while the inclined portions 8b which form ramps will act on theslide-blocks in order to initiate step (d) only when the opening of themold is finally sufficient for completion of steps (b) and (c) a centralmember having cylindrical portions l6a-l6b of different diameters andannular shoulders so as to ensure centering and positioning of saidmember in the axial direction within the base 15 of the stationaryportion of the mold, said central member 16 being provided with moldelements 17 for defining special details such as, for example, a set ofteeth on the outer face of the part to be molded and if necessary acentral bore in order to receive additional mold elements 18 for thepurpose of defining further special details such as, for example,grooves or arms 3c for the angular positioning of another set of cams(or of a positioning member). If provision is made for mold elements 18,said elements also have a central bore 18a providing a passageway forthe sliding mandrel 10 which is intended to carry the demolded part 3away from the mold (step e). (If provision is not made for said moldelements 18, the mandrel 10 is guided directly within an axial bore ofthe central member 16).

The central member is provided with other bores 16d which aredistributed around the central bore in accordance with requirements andprovide passageways for ejector rods 19 which are intended to free themolded part 3 from the mandrel at the proper time (step f) abacking-plate 20 which is embedded in the base so as to provide asupport for the central member 16 and the mold elements 18 which areconcentric with the mandrel 10.

The stationary portion of the mold further comprises a sole-piece 21 onwhich the base 15 is fixed and in which provision is essentially madefor a central bore 21a which is concentric with a hollowed-out portion21b and in which is slidably mounted a sleeve 22 provided with anannular flange 22a which is fitted within the hollowed-out portion andthe thickness of which is slightly smaller than the depth of saidhollowed-out portion 21b the difference defining the travel which isequal to one half-pitch makes it possible to carry out the displacementof the molded part 3 (step c).

The translational displacement mandrel 10 is always provided at the endnearest the molded part 3 with a special shape (which may be formed onthe molded part if requirements so dictate). Thus, in the example shownin the drawings, said mandrel is provided with a nipple 10a (intended toform the central hole of the molded part) so that the part 3 may thusremain attached to the mandrel 10 throughout the duration of step (e).At the end remote from the molded part 3, said mandrel has a cylindricalportion 10b of smaller diameter which is adapted to penetrate into abore 22b of the sleeve 22 so as to form a annular shoulder which limitsthe downward displacement of the mandrel 10 and defines its position inthe axial direction. At the end of the mandrel 10 which is remote fromthe molded part 3, there is fixed by means of a screw 23 a cylindricalspacer member 24 having a diameter which is greater than the cylindricalportion 10b of the mandrel 10 or portion of small diameter. Thisdifference in diameter constitutes in the assembly 10-24 consisting ofmandrel and spacer member an annular shoulder which is adapted tocooperate with the end wall 220 of a lower bore 22d of the sleeve so asto limit the travel of the mandrel 10 to the value whichis establishedin order to carry the molded part 3 away from the mold (step e).

The s acer mmbFhas 5a aims; tTange Mien which rests a washer 25, therebeing mounted in said washer the ejectors 19 which are disposed parallelto the mandrel 10. The washer 25 is in turn secured to a hollow plunger26 which is guided within the bore 22d of the sleeve 22 and contains apowerful spring 27 which applies the washer 25 in contact with theannular flange 24a and fixes the relative position of the ejectors 19with respect to the mandrel 10 in the axial direction.

At the time of demolding, the plunger 26 is displaced in the directionof the arrow by the ejection control devices which are provided on allpresses until the assembly 10-19-24-2526 consisting of mandrel,ejectors, spacer member, washer, plunger, has completed the travel whichis necesary to ensure that the spacer member 24 is abuttingly appliedagainst the end wall 22c of the bore 22d (step e) and the mandrel 10remains stationary. Thereupon', since the ejection devices of the presscontinue to produce action on the plunger 26, the assembly 26-25-19consisting of plunger, washer, ejectors, continues to move while causingdeflection of the spring 27 and the relative displacement of theejectors 19 with respect to the mandrel 10 results in release andfalling of the molded part (steps f and g).

The sole-piece 21 is further provided with at least one recessed portion210 so as to accommodate a bellcrank lever 14 which is pivotally mountedon a pin 28, one arm of said lever being adapted to carry a feeler lug14a so as to cooperate with the lug 6b which is placed on the exteriorof the movable portion 6 of the mold while the other arm 14b of saidlever is adapted to actuate a pusher 29 which is housed within a bore ofthe sole-piece. By producingaction on he annular flange 22a, said pushercauses the displacement of the sleeve 22 over the distance permitted bythe axial clearance (step c).

In order to achieve the second object of the inven tion, two cases areto be contemplated, depending on whether the elements which are intendedto permit adjustment of angular setting are defined by the mold elementswhich are rigidly fixed to the central members 11-16 of the movableportion 6 and of the stationary portion 15 of the mold or by the moldelements 4 which are rigidly fixed to the slide-blocks 5 which supportthe slides 4.

In the first case, the solution is very simple. The central members 11,16 are provided with a radially inserted locking-pin 30 and the movableportion 6 of the mold and base 15 of the stationary portion of the moldare both provided with a recess 6c-15a in order to accommodate saidlocking-pins 30. Two opposite screws 31 extend into each of saidrecesses at right angles to the mean position of the locking-pin 30. Byslackeningoff one of the screws 31 and by tightening-up the other screw,there is thus produced a sensitively controled rotation of the centralmember 11 or 16 and of the mold element 12 or elements 17 and 18 whichare associated with said central member.

In the second case, the slides provided in order to define the elementswhich are intended to permit adjustment of angular setting are specialslides 4' so designed as to have a circular heel 4'a, said heel beingadapted to engage in a circular groove 32a of the adjacent stationaryportion 32 so as to form a circular guide which is concentric with theaxis of the mold. Said special slides 4' are provided with two recesses4'b which are placed on each side and within which are applied twopush-rods 33 placed within bores located in the plane of thespecialslides 4. At the end located externally of the mold, the push-rodbores are tapped so as to receive screws 34 which are accessible fromthe exterior. By slackening-off one of the screws 34 and by tighteningupthe other, one of the push-rods is moved back and the other is movedforward, thereby rotating the special slide 4' on its circular guide4'a, with the angular setting of the corresponding element having thusbeen changed in a sensitive manner. When preliminary adjustments areconsidered to be final and the tool is intended to produce parts in verylarge quantities, it is recommended practice to lock the special slide4' with respect to the fixed slides 4 by piercing one or a number ofholes 35 parallel to the axis of the mold and through the entire stackof slides 4 in order to insert one or a number of locking-pins therein.

The locking-pin holes 35 are advantageously provided beforehand in theslides 4 which are not adjustable.

A portion of cylindrical surface 2c-5c is formed at the base of theslide-blocks 2-5 and coincides in the closed position of the mold withthe external surface 16a of the central member 16 which projects abovethe base so as to ensure perfect centering.

In order to carry out the angular setting of a pair of elements 4' whenthe slide-blocks 5 are applied against the member 16, two screws areslackened-off symmetrically with respect to the center and the two otherscrews are tightened-up.

An important feature of the device described in the foregoing lies inthe fact that all stages of operation are controlled by means of apositive mechanical drive system with the result that no stage can beginunless the preceding stage is completed. This is not the case withsystems employed in the prior art in which a number of operations weredependent on the elastic restoring action of a calibrated spring.

In the present invention, the single spring 27 is not calibrated sinceit is employed only for the purpose of returning free components totheir rest positions and can accordingly be designed to have adistinctly excessive spring rate.

I claim:

1. A mould for the casting of parts of complex shape, having a centralhub and multiple plane elements perpendicular to said hub, and parallelto each other, and spaced one from the other, of the same type as blockcams, of thermo-plastic or injectable heat-hardening material; and forthe automatic ejection of these parts during the opening of the mould,which can be used on an automatic moulding press; said mould having amovable part and a stationary part, first series of moulding slidesmounted in the stationary part on two initial slide blocks movablyarranged in opposite directions perpendicular to the movement of openingof the mould, and serving to defined the intervals between the pieces ofthe moulded part, and a second series of moulding slides mounted in thestationary part onto two second slide blocks movably arranged inopposite directions, at 90 from the first slide blocks and serving todefine the profiles of the said plane elements of said moulded part,said movable part including a cap having an interior conical wall, saidmould when in closed condition having said four slide blocks maintainedtightly in the direction of the center of the mould by means of saidinterior conical wall of said cap, and separated, when the mould isopened, by columns adjoining the cap and having parts forming ramps forcoacting with an oblique bore provided in each of said slide blocks, theoblique bores being of larger diameter than the columns to provide thecolumns with play at the beginning of the opening of the mould, so thatsaid opening may begin before the start of the radial shifting of thefirst and second slide blocks from the center, each of the columnscontrolling the second slide blocks having an elongated portion which isparallel to the movement of the cap of the mould and an inclined portionwhich acts on the second slide blocks only after the radial shifting ofthe first slide blocks, a bell crank lever pivotally mounted on thestationary portion of the mould, an oblique lug secured to the cap forengagement by one arm of the lever, and ejector means activated by theengagement therewith of the other arm of the lever when the lug engagessaid one arm to shift the moulded part axially a distance of half of aninterval between adjointing elements of the moulded part, the axialshifting occurring between the two above-mentioned shiftings of theslide blocks, the axis of the cap having a cylindrical sleeve sliding inthe stationary part of the mould in the direction of the movement of themovable part of this mould, said sleeve, having a flange said ejectormeans including a pusher, said flange being directed, by means of saidpusher from said other arm of the lever shifting a limited amount anddriving in the direction of the mould opening an ejection mandrel,placed on said axis; being set into motion by ejector rods.

2. The mould as claimed in claim 1, wherein arranged at the side of theflange is a sliding sleeve which is in a closed position, and having abase provided with a hole with two bores defining a shoulder which, inthe ejection direction, acts upon a corresponding shoulder of theejection mandrel; the extremity of the sleeve, opposite from the base,serving as guide to an ejection piston, capable, when moving, of actingon the ejector rods and on the ejection mandrel.

3. The mould as presented in claim 1, wherein in order to realize theangular regulation of the slide and slide blocks units serving to definethe profile of the elements of the moulded part, the mould has at leastone cylindrical part positioned on an axis and linked to a radial bolt;the angular position of the bolt being adjustable, from the outside, byopposing stop screws engaged in tapped holes of a non-rotational part ofthe mould.

4. The mould as claimed in claim 1, wherein auxiliary slides areinserted between the slides of at least one series of slides definingthe profiles of the elements of the moulded part; and wherein saidslides are adjustably arranged at an angle to allow for an angularwedging of certain of said elements.

5. The mould as claimed in claim 4, including means allowing the angularadjustment of at least one pair of auxiliary slides in relation to theslides with which they alternate, said auxiliary slides each having acircular guide rim with angular position adjustable from the outside ofthe mould, by stopscrews, engaged in tapped parallel holes in thecorresponding slide block.

6. The mould as presented in claim 1, wherein arranged at the side ofthe flange is a sliding sleeve which is in a closed position, and havinga base provided with a hole with two bores defining a shoulder which, inthe ejection direction, acts upon a corresponding shoulder of theejection mandrel; the extremity of the sleeve, opposite from the base,serving as a guide to an ejection piston, capable, which moving, ofacting on the ejector rods and on the ejection mandrel, a cylindricalportion of the ejection mandrel having small diameters is part of across-bar and a flange above which a washer is fixed to the ejectorpiston; the piston being slidably arranged in the sleeve, the washerbeing a part of the ejector rods; and a hydraulic coil inserted betweenthe base of the piston and the flange of the cross-bar.

7. The mould as presented in claim 6, wherein in order to disengage themoulded part brought out of the mould from the mandrel; the cross-barpresents a section of larger diameter than the lower section of thesmall diameter of the mandrel forming a stopper against the base of thesleeve; whereby during the forward progress of the ejector piston, andto stop the ejection movement of the mandrel, due to the give of thecoil, there is a continuing movement of ejection rods pushed back by theejector piston.

1. A mould for the casting of parts of complex shape, having a centralhub and multiple plane elements perpendicular to said hub, and parallelto each other, and spaced one from the other, of the same type as blockcams, of thermo-plastic or injectable heat-hardening material; and forthe automatic ejection of these parts during the opening of the mould,which can be used on an automatic moulding press; said mould having amovable part and a stationary part, first series of moulding slidesmounted in the stationary part on two initial slide blocks movablyarranged in opposite directions perpendicular to the movement of openingof the mould, and serving to define the intervals between the pieces ofthe moulded part, and a second series of moulding slides mounted in thestationary part onto two second slide blocks movably arranged inopposite directions, at 90* from the first slide blocks and serving todefine the profiles of the said plane elements of said moulded part,said movable part including a cap having an interior conical wall, saidmould when in closed condition having said four slide blocks maintainedtightly in the direction of the center of the mould by means of saidinterior conical wall of said cap, and separated, when the mould isopened, by columns adjoining the cap and having parts forming ramps forcoacting with an oblique bore provided in each of said slide blocks, theoblique bores being of larger diameter than the columns to provide thecolumns with play at the beginning of the opening of the mould, so thatsaid opening may begin before the start of the radial shifting of thefirst and second slide blocks from the center, each of the columnscontrolling the second slide blocks having an elongated portion which isparallel to the movement of the cap of the mould and an inclined portionwhich acts on the second slide blocks only after the radial shifting ofthe first slide blocks, a bell crank lever pivotally mounted on thestationary portion of the mould, an oblique lug secured to the cap forengagement by one arm of the lever, and ejector means activated by theengagement therewith of the other arm of the lever when the lug engagessaid one arm to shift the moulded part axially a distance of half of aninterval between adjointing elements of the moulded part, the axialshifting occurring between the two above-mentioned shiftings of theslide blocks, the axis of the cap having a cylindrical sleeve sliding inthe stationary part of the mould in the direction of the movement of themovable part of this mould, said sleeve, having a flange said ejectormeans including a pusher, said flange being directed, by means of saidpusher from said other arm of the lever shifting a limited amount anddriving in the direction of the mould opening an ejection mandrel,placed on said axis; being set into motion by ejector rods.
 2. The mouldas claimed in claim 1, wherein arranged at the side of the flange is asliding sleeve which is in a closed position, and having a base providedwith a hole with two bores defining a shoulder which, in the ejectiondirection, acts upon a corresponding shoulder of the ejection mandrel;the extremity of the sleeve, opposite from the base, serving as guide toan ejection piston, cApable, when moving, of acting on the ejector rodsand on the ejection mandrel.
 3. The mould as presented in claim 1,wherein in order to realize the angular regulation of the slide andslide blocks units serving to define the profile of the elements of themoulded part, the mould has at least one cylindrical part positioned onan axis and linked to a radial bolt; the angular position of the boltbeing adjustable, from the outside, by opposing stop screws engaged intapped holes of a non-rotational part of the mould.
 4. The mould asclaimed in claim 1, wherein auxiliary slides are inserted between theslides of at least one series of slides defining the profiles of theelements of the moulded part; and wherein said slides are adjustablyarranged at an angle to allow for an angular wedging of certain of saidelements.
 5. The mould as claimed in claim 4, including means allowingthe angular adjustment of at least one pair of auxiliary slides inrelation to the slides with which they alternate, said auxiliary slideseach having a circular guide rim with angular position adjustable fromthe outside of the mould, by stopscrews, engaged in tapped parallelholes in the corresponding slide block.
 6. The mould as presented inclaim 1, wherein arranged at the side of the flange is a sliding sleevewhich is in a closed position, and having a base provided with a holewith two bores defining a shoulder which, in the ejection direction,acts upon a corresponding shoulder of the ejection mandrel; theextremity of the sleeve, opposite from the base, serving as a guide toan ejection piston, capable, which moving, of acting on the ejector rodsand on the ejection mandrel, a cylindrical portion of the ejectionmandrel having small diameters is part of a cross-bar and a flange abovewhich a washer is fixed to the ejector piston; the piston being slidablyarranged in the sleeve, the washer being a part of the ejector rods; anda hydraulic coil inserted between the base of the piston and the flangeof the cross-bar.
 7. The mould as presented in claim 6, wherein in orderto disengage the moulded part brought out of the mould from the mandrel;the cross-bar presents a section of larger diameter than the lowersection of the small diameter of the mandrel forming a stopper againstthe base of the sleeve; whereby during the forward progress of theejector piston, and to stop the ejection movement of the mandrel, due tothe give of the coil, there is a continuing movement of ejection rodspushed back by the ejector piston.